16. Perhatikan bangun berikut! 28 cm
Penyelesaian:
diameter lingkaran besar=28cm(r=14cm)
diameter lingkaran kecil=14cm(r=7cm)
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L=Πr²
L=22/7×14×14
L=22×2×14
L=616cm²
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L=2Πr²(2lingkaran kecil)
L=2×22/7×7×7
L=2×22×7
L=2×154
L=308'cm²
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L diarsir:
L besar-L kecil
=616-308
=308cm²(D.)
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